Anisotropic spin-fluctuations in SmCoPO revealed by 31^P NMR measurement

Details Anisotropic spin-fluctuations in SmCoPO revealed by 31^P NMR measurement Anisotropic spin-fluctuations in SmCoPO revealed by 31^P NMR measurement

2011-09-19

arxiv.org/abs/1109.3955v2

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 8 figures, revised version

Scientific paper

The spectral features of 31P NMR in SmCoPO reveal an axially symmetric local magnetic field. At low temperature, the anisotropy of the internal magnetic field increases rapidly. The dominant contribution to this anisotropy arises from Sm-4f electron contribution over that of Co-3d. The intrinsic width 2beta deviates from linearity with respect to bulk susceptibility below 170 K due to the enhancement of 1/T_2_dynamic. The significant enhancement of 1/T_2_dynamic along with the continuous increase of anisotropy in the internal magnetic field is responsible for the wipe out effect of the NMR signal intensity, well above T_C. Absence of anisotropy in 1/T_2 indicates the isotropic nature of the longitudinal component of the fluctuating local magnetic field. 1/T_1 in SmCoPO shows large anisotropy compared to that in LaCoPO. This confirms a significant contribution of Sm-4f electron spin fluctuations to 1/T_1, arising from indirect RKKY type exchange interaction between Sm-4f moments and indicates a non-negligible hybridization between Sm-4$f$ orbitals and the conduction band, over and above the itinerant character of the Co-3d spins. The anisotropy in 1/T_1 originates mainly from the orientation dependence of chi^\prime\prime(q,omega) over a contribution from H_hf. The 3d-spin fluctuations in the $ab$ plane is primarily of 2D FM in nature, while along the c-axis, a signature of a weak 2D AFM spin fluctuations superimposed on weak FM spin-fluctuations even in a field of 7 T and far above T_N is observed. The enhancement of this AFM fluctuations of the Co-3d spins along c-axis in SmCoPO, at further low temperature is responsible to drive the system to an AFM ordered state. The interaction between Sm-4f and Co-3d spin fluctuations, should have an important role in the development of weak AFM spin fluctuations along c-axis.

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